I was driving and all of a sudden all of this pops up I drive a 2006 suburban. Can someone help me figure out what this all means?

while manufacturers use the advertised economy figures for sales, testing by reputable auto mobile organizations report that the figures are unrealistic and are generated in perfect conditions in shop
They seldom say real driving conditions just what was achieved in testing
If you are getting 8/100 suburban and better on highway then the economy is good
however it is to be understood that tire widths , pressures , loads , road conditions , ac operation ( not taken into consideration in factory testing) driver habits ( placing auto in neutral while at lights saves fuel)
hard acceleration ' sudden stops, driving over 60mph or 100 km all affect real consumption figures
as for advice , use a quality octane rating-no e-mix fuels - and drive like the tank has a hole in it and you have to conserve every drop

If you have someone to assist you, remove the distributor cap, then have someone crank the engine when you are watching the distributor. If the rotor button does not turn with the engine then you have either broken the drive or your timing chain. this is the first check, then get in touch for the next step

As dependable as all the old suburbans must be, they can't defy GM's planned obsolescence schemes forever. I was trying to help a friend keep his '78 suburban's lighting going. It ran great, but looked like half the stuff under the dash had been broken at one time, and patched back together. The wiring was a real colorful mess.
All you can do with the automatics is check the level and condition of the fluid. Never let it run low for long, or it will burn out. If the fluid looks burnt or dark brown, it's probably bad. You would want to have a shop or transmission shop verify or diagnose it to be sure, because rebuilding yours is a huge expense, just as a rebuilt one you could find would be expensive. A used one? You are always taking chances with a used transmission- it's real iffy. Lots cheaper, if you want to roll the dice, lol. Its your call. How fond are you of your suburban? .

To pass out means to lose consciousness due to a sudden trauma. More diagnostic tools for car.

It could be the linkage. Jiggle the shifter to see if that helps. When it goes in reverse the trans opens other valves to put trans fluid (under pressure) to the reverse unit. If the trans has not had a trans service every 30k or so the fluid could get dirty ans gummey. There are trans additives can claim the desolve the gum. I have donethat before and it has helped my trans. They claim no damage to the trans. - I tried it

yes, you just lost reverse, right?

fuel pump or fuel filter. have someone kneel near fuel tank and listen for buzzing noise when ignition is turn on if you hear the sound i would change filter

Before condemning the transmission, I would check the shift cable for proper operation. Look at the side of the transmission where the shift cable attaches. Have someone shift the transmission from PARK to FIRST. The engine should not be running. If the operating lever on the transmission moves, then you probably do have an internal transmission problem.
If the operating lever does not move, you have a broken shift cable or it has popped of it's attachments at the operating lever or gear shift handle.

A bad Transmission Control Module (TCM) would not keep it from shifting. In the event of a bad TCM, the transmission would go into fail safe mode and you could continue driving the vehicle.

I doubt it's your 4x4. Most transfer case will start turning the front driveshaft, meaning that BOTH front wheels would try to turn.

Could be a brake pad/caliper locking up on your left wheel. That'll make that wheel turn slower resulting in the veering left.

Could also be a wheel bearing. However usually you'll hear a grinding noise to go along with that. And it'll pull rather consistently in that direction rather than suddenly.

Or, what first comes to mind is that your steering box is loose, or the gear inside the steering box is stripped in one spot. Or your front tie rods could be shifting or possibly ball joints. These would cause a sudden shifting/veering.

All of these things are front end related. And also very dangerous. Take it down to any alignment shop, have them put it on a lift, and diagnose immediately.

Worse case scenerio is that a front end part breaks and sends you out of control and into someone else. Please get it checked. A diesel Suburban could do a lot of damage.

you need the trany rebuilt